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ceph: fix dangling pointer
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / compat.c
blob0644a154672b93012a4d7a7f864ba7f505b43213
1 /*
2 * linux/fs/compat.c
3 *
4 * Kernel compatibililty routines for e.g. 32 bit syscall support
5 * on 64 bit kernels.
6 *
7 * Copyright (C) 2002 Stephen Rothwell, IBM Corporation
8 * Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
9 * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
10 * Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
11 * Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/stddef.h>
19 #include <linux/kernel.h>
20 #include <linux/linkage.h>
21 #include <linux/compat.h>
22 #include <linux/errno.h>
23 #include <linux/time.h>
24 #include <linux/fs.h>
25 #include <linux/fcntl.h>
26 #include <linux/namei.h>
27 #include <linux/file.h>
28 #include <linux/fdtable.h>
29 #include <linux/vfs.h>
30 #include <linux/ioctl.h>
31 #include <linux/init.h>
32 #include <linux/smb.h>
33 #include <linux/smb_mount.h>
34 #include <linux/ncp_mount.h>
35 #include <linux/nfs4_mount.h>
36 #include <linux/syscalls.h>
37 #include <linux/ctype.h>
38 #include <linux/module.h>
39 #include <linux/dirent.h>
40 #include <linux/fsnotify.h>
41 #include <linux/highuid.h>
42 #include <linux/nfsd/syscall.h>
43 #include <linux/personality.h>
44 #include <linux/rwsem.h>
45 #include <linux/tsacct_kern.h>
46 #include <linux/security.h>
47 #include <linux/highmem.h>
48 #include <linux/signal.h>
49 #include <linux/poll.h>
50 #include <linux/mm.h>
51 #include <linux/eventpoll.h>
52 #include <linux/fs_struct.h>
53 #include <linux/slab.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/mmu_context.h>
57 #include <asm/ioctls.h>
58 #include "internal.h"
59
60 int compat_log = 1;
61
62 int compat_printk(const char *fmt, ...)
63 {
64 va_list ap;
65 int ret;
66 if (!compat_log)
67 return 0;
68 va_start(ap, fmt);
69 ret = vprintk(fmt, ap);
70 va_end(ap);
71 return ret;
72 }
73
74 #include "read_write.h"
75
76 /*
77 * Not all architectures have sys_utime, so implement this in terms
78 * of sys_utimes.
79 */
80 asmlinkage long compat_sys_utime(const char __user *filename,
81 struct compat_utimbuf __user *t)
82 {
83 struct timespec tv[2];
84
85 if (t) {
86 if (get_user(tv[0].tv_sec, &t->actime) ||
87 get_user(tv[1].tv_sec, &t->modtime))
88 return -EFAULT;
89 tv[0].tv_nsec = 0;
90 tv[1].tv_nsec = 0;
91 }
92 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
93 }
94
95 asmlinkage long compat_sys_utimensat(unsigned int dfd, const char __user *filename, struct compat_timespec __user *t, int flags)
96 {
97 struct timespec tv[2];
98
99 if (t) {
100 if (get_compat_timespec(&tv[0], &t[0]) ||
101 get_compat_timespec(&tv[1], &t[1]))
102 return -EFAULT;
103
104 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
105 return 0;
106 }
107 return do_utimes(dfd, filename, t ? tv : NULL, flags);
108 }
109
110 asmlinkage long compat_sys_futimesat(unsigned int dfd, const char __user *filename, struct compat_timeval __user *t)
111 {
112 struct timespec tv[2];
113
114 if (t) {
115 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
116 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
117 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
118 get_user(tv[1].tv_nsec, &t[1].tv_usec))
119 return -EFAULT;
120 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
121 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
122 return -EINVAL;
123 tv[0].tv_nsec *= 1000;
124 tv[1].tv_nsec *= 1000;
125 }
126 return do_utimes(dfd, filename, t ? tv : NULL, 0);
127 }
128
129 asmlinkage long compat_sys_utimes(const char __user *filename, struct compat_timeval __user *t)
130 {
131 return compat_sys_futimesat(AT_FDCWD, filename, t);
132 }
133
134 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
135 {
136 compat_ino_t ino = stat->ino;
137 typeof(ubuf->st_uid) uid = 0;
138 typeof(ubuf->st_gid) gid = 0;
139 int err;
140
141 SET_UID(uid, stat->uid);
142 SET_GID(gid, stat->gid);
143
144 if ((u64) stat->size > MAX_NON_LFS ||
145 !old_valid_dev(stat->dev) ||
146 !old_valid_dev(stat->rdev))
147 return -EOVERFLOW;
148 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
149 return -EOVERFLOW;
150
151 if (clear_user(ubuf, sizeof(*ubuf)))
152 return -EFAULT;
153
154 err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
155 err |= __put_user(ino, &ubuf->st_ino);
156 err |= __put_user(stat->mode, &ubuf->st_mode);
157 err |= __put_user(stat->nlink, &ubuf->st_nlink);
158 err |= __put_user(uid, &ubuf->st_uid);
159 err |= __put_user(gid, &ubuf->st_gid);
160 err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
161 err |= __put_user(stat->size, &ubuf->st_size);
162 err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
163 err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
164 err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
165 err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
166 err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
167 err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
168 err |= __put_user(stat->blksize, &ubuf->st_blksize);
169 err |= __put_user(stat->blocks, &ubuf->st_blocks);
170 return err;
171 }
172
173 asmlinkage long compat_sys_newstat(const char __user * filename,
174 struct compat_stat __user *statbuf)
175 {
176 struct kstat stat;
177 int error;
178
179 error = vfs_stat(filename, &stat);
180 if (error)
181 return error;
182 return cp_compat_stat(&stat, statbuf);
183 }
184
185 asmlinkage long compat_sys_newlstat(const char __user * filename,
186 struct compat_stat __user *statbuf)
187 {
188 struct kstat stat;
189 int error;
190
191 error = vfs_lstat(filename, &stat);
192 if (error)
193 return error;
194 return cp_compat_stat(&stat, statbuf);
195 }
196
197 #ifndef __ARCH_WANT_STAT64
198 asmlinkage long compat_sys_newfstatat(unsigned int dfd,
199 const char __user *filename,
200 struct compat_stat __user *statbuf, int flag)
201 {
202 struct kstat stat;
203 int error;
204
205 error = vfs_fstatat(dfd, filename, &stat, flag);
206 if (error)
207 return error;
208 return cp_compat_stat(&stat, statbuf);
209 }
210 #endif
211
212 asmlinkage long compat_sys_newfstat(unsigned int fd,
213 struct compat_stat __user * statbuf)
214 {
215 struct kstat stat;
216 int error = vfs_fstat(fd, &stat);
217
218 if (!error)
219 error = cp_compat_stat(&stat, statbuf);
220 return error;
221 }
222
223 static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
224 {
225
226 if (sizeof ubuf->f_blocks == 4) {
227 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
228 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
229 return -EOVERFLOW;
230 /* f_files and f_ffree may be -1; it's okay
231 * to stuff that into 32 bits */
232 if (kbuf->f_files != 0xffffffffffffffffULL
233 && (kbuf->f_files & 0xffffffff00000000ULL))
234 return -EOVERFLOW;
235 if (kbuf->f_ffree != 0xffffffffffffffffULL
236 && (kbuf->f_ffree & 0xffffffff00000000ULL))
237 return -EOVERFLOW;
238 }
239 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
240 __put_user(kbuf->f_type, &ubuf->f_type) ||
241 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
242 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
243 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
244 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
245 __put_user(kbuf->f_files, &ubuf->f_files) ||
246 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
247 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
248 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
249 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
250 __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
251 __put_user(0, &ubuf->f_spare[0]) ||
252 __put_user(0, &ubuf->f_spare[1]) ||
253 __put_user(0, &ubuf->f_spare[2]) ||
254 __put_user(0, &ubuf->f_spare[3]) ||
255 __put_user(0, &ubuf->f_spare[4]))
256 return -EFAULT;
257 return 0;
258 }
259
260 /*
261 * The following statfs calls are copies of code from fs/open.c and
262 * should be checked against those from time to time
263 */
264 asmlinkage long compat_sys_statfs(const char __user *pathname, struct compat_statfs __user *buf)
265 {
266 struct path path;
267 int error;
268
269 error = user_path(pathname, &path);
270 if (!error) {
271 struct kstatfs tmp;
272 error = vfs_statfs(&path, &tmp);
273 if (!error)
274 error = put_compat_statfs(buf, &tmp);
275 path_put(&path);
276 }
277 return error;
278 }
279
280 asmlinkage long compat_sys_fstatfs(unsigned int fd, struct compat_statfs __user *buf)
281 {
282 struct file * file;
283 struct kstatfs tmp;
284 int error;
285
286 error = -EBADF;
287 file = fget(fd);
288 if (!file)
289 goto out;
290 error = vfs_statfs(&file->f_path, &tmp);
291 if (!error)
292 error = put_compat_statfs(buf, &tmp);
293 fput(file);
294 out:
295 return error;
296 }
297
298 static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
299 {
300 if (sizeof ubuf->f_blocks == 4) {
301 if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
302 kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
303 return -EOVERFLOW;
304 /* f_files and f_ffree may be -1; it's okay
305 * to stuff that into 32 bits */
306 if (kbuf->f_files != 0xffffffffffffffffULL
307 && (kbuf->f_files & 0xffffffff00000000ULL))
308 return -EOVERFLOW;
309 if (kbuf->f_ffree != 0xffffffffffffffffULL
310 && (kbuf->f_ffree & 0xffffffff00000000ULL))
311 return -EOVERFLOW;
312 }
313 if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
314 __put_user(kbuf->f_type, &ubuf->f_type) ||
315 __put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
316 __put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
317 __put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
318 __put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
319 __put_user(kbuf->f_files, &ubuf->f_files) ||
320 __put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
321 __put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
322 __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
323 __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
324 __put_user(kbuf->f_frsize, &ubuf->f_frsize))
325 return -EFAULT;
326 return 0;
327 }
328
329 asmlinkage long compat_sys_statfs64(const char __user *pathname, compat_size_t sz, struct compat_statfs64 __user *buf)
330 {
331 struct path path;
332 int error;
333
334 if (sz != sizeof(*buf))
335 return -EINVAL;
336
337 error = user_path(pathname, &path);
338 if (!error) {
339 struct kstatfs tmp;
340 error = vfs_statfs(&path, &tmp);
341 if (!error)
342 error = put_compat_statfs64(buf, &tmp);
343 path_put(&path);
344 }
345 return error;
346 }
347
348 asmlinkage long compat_sys_fstatfs64(unsigned int fd, compat_size_t sz, struct compat_statfs64 __user *buf)
349 {
350 struct file * file;
351 struct kstatfs tmp;
352 int error;
353
354 if (sz != sizeof(*buf))
355 return -EINVAL;
356
357 error = -EBADF;
358 file = fget(fd);
359 if (!file)
360 goto out;
361 error = vfs_statfs(&file->f_path, &tmp);
362 if (!error)
363 error = put_compat_statfs64(buf, &tmp);
364 fput(file);
365 out:
366 return error;
367 }
368
369 /*
370 * This is a copy of sys_ustat, just dealing with a structure layout.
371 * Given how simple this syscall is that apporach is more maintainable
372 * than the various conversion hacks.
373 */
374 asmlinkage long compat_sys_ustat(unsigned dev, struct compat_ustat __user *u)
375 {
376 struct super_block *sb;
377 struct compat_ustat tmp;
378 struct kstatfs sbuf;
379 int err;
380
381 sb = user_get_super(new_decode_dev(dev));
382 if (!sb)
383 return -EINVAL;
384 err = statfs_by_dentry(sb->s_root, &sbuf);
385 drop_super(sb);
386 if (err)
387 return err;
388
389 memset(&tmp, 0, sizeof(struct compat_ustat));
390 tmp.f_tfree = sbuf.f_bfree;
391 tmp.f_tinode = sbuf.f_ffree;
392 if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
393 return -EFAULT;
394 return 0;
395 }
396
397 static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
398 {
399 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
400 __get_user(kfl->l_type, &ufl->l_type) ||
401 __get_user(kfl->l_whence, &ufl->l_whence) ||
402 __get_user(kfl->l_start, &ufl->l_start) ||
403 __get_user(kfl->l_len, &ufl->l_len) ||
404 __get_user(kfl->l_pid, &ufl->l_pid))
405 return -EFAULT;
406 return 0;
407 }
408
409 static int put_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
410 {
411 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
412 __put_user(kfl->l_type, &ufl->l_type) ||
413 __put_user(kfl->l_whence, &ufl->l_whence) ||
414 __put_user(kfl->l_start, &ufl->l_start) ||
415 __put_user(kfl->l_len, &ufl->l_len) ||
416 __put_user(kfl->l_pid, &ufl->l_pid))
417 return -EFAULT;
418 return 0;
419 }
420
421 #ifndef HAVE_ARCH_GET_COMPAT_FLOCK64
422 static int get_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
423 {
424 if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
425 __get_user(kfl->l_type, &ufl->l_type) ||
426 __get_user(kfl->l_whence, &ufl->l_whence) ||
427 __get_user(kfl->l_start, &ufl->l_start) ||
428 __get_user(kfl->l_len, &ufl->l_len) ||
429 __get_user(kfl->l_pid, &ufl->l_pid))
430 return -EFAULT;
431 return 0;
432 }
433 #endif
434
435 #ifndef HAVE_ARCH_PUT_COMPAT_FLOCK64
436 static int put_compat_flock64(struct flock *kfl, struct compat_flock64 __user *ufl)
437 {
438 if (!access_ok(VERIFY_WRITE, ufl, sizeof(*ufl)) ||
439 __put_user(kfl->l_type, &ufl->l_type) ||
440 __put_user(kfl->l_whence, &ufl->l_whence) ||
441 __put_user(kfl->l_start, &ufl->l_start) ||
442 __put_user(kfl->l_len, &ufl->l_len) ||
443 __put_user(kfl->l_pid, &ufl->l_pid))
444 return -EFAULT;
445 return 0;
446 }
447 #endif
448
449 asmlinkage long compat_sys_fcntl64(unsigned int fd, unsigned int cmd,
450 unsigned long arg)
451 {
452 mm_segment_t old_fs;
453 struct flock f;
454 long ret;
455
456 switch (cmd) {
457 case F_GETLK:
458 case F_SETLK:
459 case F_SETLKW:
460 ret = get_compat_flock(&f, compat_ptr(arg));
461 if (ret != 0)
462 break;
463 old_fs = get_fs();
464 set_fs(KERNEL_DS);
465 ret = sys_fcntl(fd, cmd, (unsigned long)&f);
466 set_fs(old_fs);
467 if (cmd == F_GETLK && ret == 0) {
468 /* GETLK was successful and we need to return the data...
469 * but it needs to fit in the compat structure.
470 * l_start shouldn't be too big, unless the original
471 * start + end is greater than COMPAT_OFF_T_MAX, in which
472 * case the app was asking for trouble, so we return
473 * -EOVERFLOW in that case.
474 * l_len could be too big, in which case we just truncate it,
475 * and only allow the app to see that part of the conflicting
476 * lock that might make sense to it anyway
477 */
478
479 if (f.l_start > COMPAT_OFF_T_MAX)
480 ret = -EOVERFLOW;
481 if (f.l_len > COMPAT_OFF_T_MAX)
482 f.l_len = COMPAT_OFF_T_MAX;
483 if (ret == 0)
484 ret = put_compat_flock(&f, compat_ptr(arg));
485 }
486 break;
487
488 case F_GETLK64:
489 case F_SETLK64:
490 case F_SETLKW64:
491 ret = get_compat_flock64(&f, compat_ptr(arg));
492 if (ret != 0)
493 break;
494 old_fs = get_fs();
495 set_fs(KERNEL_DS);
496 ret = sys_fcntl(fd, (cmd == F_GETLK64) ? F_GETLK :
497 ((cmd == F_SETLK64) ? F_SETLK : F_SETLKW),
498 (unsigned long)&f);
499 set_fs(old_fs);
500 if (cmd == F_GETLK64 && ret == 0) {
501 /* need to return lock information - see above for commentary */
502 if (f.l_start > COMPAT_LOFF_T_MAX)
503 ret = -EOVERFLOW;
504 if (f.l_len > COMPAT_LOFF_T_MAX)
505 f.l_len = COMPAT_LOFF_T_MAX;
506 if (ret == 0)
507 ret = put_compat_flock64(&f, compat_ptr(arg));
508 }
509 break;
510
511 default:
512 ret = sys_fcntl(fd, cmd, arg);
513 break;
514 }
515 return ret;
516 }
517
518 asmlinkage long compat_sys_fcntl(unsigned int fd, unsigned int cmd,
519 unsigned long arg)
520 {
521 if ((cmd == F_GETLK64) || (cmd == F_SETLK64) || (cmd == F_SETLKW64))
522 return -EINVAL;
523 return compat_sys_fcntl64(fd, cmd, arg);
524 }
525
526 asmlinkage long
527 compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p)
528 {
529 long ret;
530 aio_context_t ctx64;
531
532 mm_segment_t oldfs = get_fs();
533 if (unlikely(get_user(ctx64, ctx32p)))
534 return -EFAULT;
535
536 set_fs(KERNEL_DS);
537 /* The __user pointer cast is valid because of the set_fs() */
538 ret = sys_io_setup(nr_reqs, (aio_context_t __user *) &ctx64);
539 set_fs(oldfs);
540 /* truncating is ok because it's a user address */
541 if (!ret)
542 ret = put_user((u32) ctx64, ctx32p);
543 return ret;
544 }
545
546 asmlinkage long
547 compat_sys_io_getevents(aio_context_t ctx_id,
548 unsigned long min_nr,
549 unsigned long nr,
550 struct io_event __user *events,
551 struct compat_timespec __user *timeout)
552 {
553 long ret;
554 struct timespec t;
555 struct timespec __user *ut = NULL;
556
557 ret = -EFAULT;
558 if (unlikely(!access_ok(VERIFY_WRITE, events,
559 nr * sizeof(struct io_event))))
560 goto out;
561 if (timeout) {
562 if (get_compat_timespec(&t, timeout))
563 goto out;
564
565 ut = compat_alloc_user_space(sizeof(*ut));
566 if (copy_to_user(ut, &t, sizeof(t)) )
567 goto out;
568 }
569 ret = sys_io_getevents(ctx_id, min_nr, nr, events, ut);
570 out:
571 return ret;
572 }
573
574 /* A write operation does a read from user space and vice versa */
575 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
576
577 ssize_t compat_rw_copy_check_uvector(int type,
578 const struct compat_iovec __user *uvector, unsigned long nr_segs,
579 unsigned long fast_segs, struct iovec *fast_pointer,
580 struct iovec **ret_pointer)
581 {
582 compat_ssize_t tot_len;
583 struct iovec *iov = *ret_pointer = fast_pointer;
584 ssize_t ret = 0;
585 int seg;
586
587 /*
588 * SuS says "The readv() function *may* fail if the iovcnt argument
589 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
590 * traditionally returned zero for zero segments, so...
591 */
592 if (nr_segs == 0)
593 goto out;
594
595 ret = -EINVAL;
596 if (nr_segs > UIO_MAXIOV || nr_segs < 0)
597 goto out;
598 if (nr_segs > fast_segs) {
599 ret = -ENOMEM;
600 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
601 if (iov == NULL) {
602 *ret_pointer = fast_pointer;
603 goto out;
604 }
605 }
606 *ret_pointer = iov;
607
608 /*
609 * Single unix specification:
610 * We should -EINVAL if an element length is not >= 0 and fitting an
611 * ssize_t. The total length is fitting an ssize_t
612 *
613 * Be careful here because iov_len is a size_t not an ssize_t
614 */
615 tot_len = 0;
616 ret = -EINVAL;
617 for (seg = 0; seg < nr_segs; seg++) {
618 compat_ssize_t tmp = tot_len;
619 compat_uptr_t buf;
620 compat_ssize_t len;
621
622 if (__get_user(len, &uvector->iov_len) ||
623 __get_user(buf, &uvector->iov_base)) {
624 ret = -EFAULT;
625 goto out;
626 }
627 if (len < 0) /* size_t not fitting in compat_ssize_t .. */
628 goto out;
629 tot_len += len;
630 if (tot_len < tmp) /* maths overflow on the compat_ssize_t */
631 goto out;
632 if (!access_ok(vrfy_dir(type), compat_ptr(buf), len)) {
633 ret = -EFAULT;
634 goto out;
635 }
636 iov->iov_base = compat_ptr(buf);
637 iov->iov_len = (compat_size_t) len;
638 uvector++;
639 iov++;
640 }
641 ret = tot_len;
642
643 out:
644 return ret;
645 }
646
647 static inline long
648 copy_iocb(long nr, u32 __user *ptr32, struct iocb __user * __user *ptr64)
649 {
650 compat_uptr_t uptr;
651 int i;
652
653 for (i = 0; i < nr; ++i) {
654 if (get_user(uptr, ptr32 + i))
655 return -EFAULT;
656 if (put_user(compat_ptr(uptr), ptr64 + i))
657 return -EFAULT;
658 }
659 return 0;
660 }
661
662 #define MAX_AIO_SUBMITS (PAGE_SIZE/sizeof(struct iocb *))
663
664 asmlinkage long
665 compat_sys_io_submit(aio_context_t ctx_id, int nr, u32 __user *iocb)
666 {
667 struct iocb __user * __user *iocb64;
668 long ret;
669
670 if (unlikely(nr < 0))
671 return -EINVAL;
672
673 if (nr > MAX_AIO_SUBMITS)
674 nr = MAX_AIO_SUBMITS;
675
676 iocb64 = compat_alloc_user_space(nr * sizeof(*iocb64));
677 ret = copy_iocb(nr, iocb, iocb64);
678 if (!ret)
679 ret = do_io_submit(ctx_id, nr, iocb64, 1);
680 return ret;
681 }
682
683 struct compat_ncp_mount_data {
684 compat_int_t version;
685 compat_uint_t ncp_fd;
686 __compat_uid_t mounted_uid;
687 compat_pid_t wdog_pid;
688 unsigned char mounted_vol[NCP_VOLNAME_LEN + 1];
689 compat_uint_t time_out;
690 compat_uint_t retry_count;
691 compat_uint_t flags;
692 __compat_uid_t uid;
693 __compat_gid_t gid;
694 compat_mode_t file_mode;
695 compat_mode_t dir_mode;
696 };
697
698 struct compat_ncp_mount_data_v4 {
699 compat_int_t version;
700 compat_ulong_t flags;
701 compat_ulong_t mounted_uid;
702 compat_long_t wdog_pid;
703 compat_uint_t ncp_fd;
704 compat_uint_t time_out;
705 compat_uint_t retry_count;
706 compat_ulong_t uid;
707 compat_ulong_t gid;
708 compat_ulong_t file_mode;
709 compat_ulong_t dir_mode;
710 };
711
712 static void *do_ncp_super_data_conv(void *raw_data)
713 {
714 int version = *(unsigned int *)raw_data;
715
716 if (version == 3) {
717 struct compat_ncp_mount_data *c_n = raw_data;
718 struct ncp_mount_data *n = raw_data;
719
720 n->dir_mode = c_n->dir_mode;
721 n->file_mode = c_n->file_mode;
722 n->gid = c_n->gid;
723 n->uid = c_n->uid;
724 memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int)));
725 n->wdog_pid = c_n->wdog_pid;
726 n->mounted_uid = c_n->mounted_uid;
727 } else if (version == 4) {
728 struct compat_ncp_mount_data_v4 *c_n = raw_data;
729 struct ncp_mount_data_v4 *n = raw_data;
730
731 n->dir_mode = c_n->dir_mode;
732 n->file_mode = c_n->file_mode;
733 n->gid = c_n->gid;
734 n->uid = c_n->uid;
735 n->retry_count = c_n->retry_count;
736 n->time_out = c_n->time_out;
737 n->ncp_fd = c_n->ncp_fd;
738 n->wdog_pid = c_n->wdog_pid;
739 n->mounted_uid = c_n->mounted_uid;
740 n->flags = c_n->flags;
741 } else if (version != 5) {
742 return NULL;
743 }
744
745 return raw_data;
746 }
747
748 struct compat_smb_mount_data {
749 compat_int_t version;
750 __compat_uid_t mounted_uid;
751 __compat_uid_t uid;
752 __compat_gid_t gid;
753 compat_mode_t file_mode;
754 compat_mode_t dir_mode;
755 };
756
757 static void *do_smb_super_data_conv(void *raw_data)
758 {
759 struct smb_mount_data *s = raw_data;
760 struct compat_smb_mount_data *c_s = raw_data;
761
762 if (c_s->version != SMB_MOUNT_OLDVERSION)
763 goto out;
764 s->dir_mode = c_s->dir_mode;
765 s->file_mode = c_s->file_mode;
766 s->gid = c_s->gid;
767 s->uid = c_s->uid;
768 s->mounted_uid = c_s->mounted_uid;
769 out:
770 return raw_data;
771 }
772
773 struct compat_nfs_string {
774 compat_uint_t len;
775 compat_uptr_t data;
776 };
777
778 static inline void compat_nfs_string(struct nfs_string *dst,
779 struct compat_nfs_string *src)
780 {
781 dst->data = compat_ptr(src->data);
782 dst->len = src->len;
783 }
784
785 struct compat_nfs4_mount_data_v1 {
786 compat_int_t version;
787 compat_int_t flags;
788 compat_int_t rsize;
789 compat_int_t wsize;
790 compat_int_t timeo;
791 compat_int_t retrans;
792 compat_int_t acregmin;
793 compat_int_t acregmax;
794 compat_int_t acdirmin;
795 compat_int_t acdirmax;
796 struct compat_nfs_string client_addr;
797 struct compat_nfs_string mnt_path;
798 struct compat_nfs_string hostname;
799 compat_uint_t host_addrlen;
800 compat_uptr_t host_addr;
801 compat_int_t proto;
802 compat_int_t auth_flavourlen;
803 compat_uptr_t auth_flavours;
804 };
805
806 static int do_nfs4_super_data_conv(void *raw_data)
807 {
808 int version = *(compat_uint_t *) raw_data;
809
810 if (version == 1) {
811 struct compat_nfs4_mount_data_v1 *raw = raw_data;
812 struct nfs4_mount_data *real = raw_data;
813
814 /* copy the fields backwards */
815 real->auth_flavours = compat_ptr(raw->auth_flavours);
816 real->auth_flavourlen = raw->auth_flavourlen;
817 real->proto = raw->proto;
818 real->host_addr = compat_ptr(raw->host_addr);
819 real->host_addrlen = raw->host_addrlen;
820 compat_nfs_string(&real->hostname, &raw->hostname);
821 compat_nfs_string(&real->mnt_path, &raw->mnt_path);
822 compat_nfs_string(&real->client_addr, &raw->client_addr);
823 real->acdirmax = raw->acdirmax;
824 real->acdirmin = raw->acdirmin;
825 real->acregmax = raw->acregmax;
826 real->acregmin = raw->acregmin;
827 real->retrans = raw->retrans;
828 real->timeo = raw->timeo;
829 real->wsize = raw->wsize;
830 real->rsize = raw->rsize;
831 real->flags = raw->flags;
832 real->version = raw->version;
833 }
834
835 return 0;
836 }
837
838 #define SMBFS_NAME "smbfs"
839 #define NCPFS_NAME "ncpfs"
840 #define NFS4_NAME "nfs4"
841
842 asmlinkage long compat_sys_mount(const char __user * dev_name,
843 const char __user * dir_name,
844 const char __user * type, unsigned long flags,
845 const void __user * data)
846 {
847 char *kernel_type;
848 unsigned long data_page;
849 char *kernel_dev;
850 char *dir_page;
851 int retval;
852
853 retval = copy_mount_string(type, &kernel_type);
854 if (retval < 0)
855 goto out;
856
857 dir_page = getname(dir_name);
858 retval = PTR_ERR(dir_page);
859 if (IS_ERR(dir_page))
860 goto out1;
861
862 retval = copy_mount_string(dev_name, &kernel_dev);
863 if (retval < 0)
864 goto out2;
865
866 retval = copy_mount_options(data, &data_page);
867 if (retval < 0)
868 goto out3;
869
870 retval = -EINVAL;
871
872 if (kernel_type && data_page) {
873 if (!strcmp(kernel_type, SMBFS_NAME)) {
874 do_smb_super_data_conv((void *)data_page);
875 } else if (!strcmp(kernel_type, NCPFS_NAME)) {
876 do_ncp_super_data_conv((void *)data_page);
877 } else if (!strcmp(kernel_type, NFS4_NAME)) {
878 if (do_nfs4_super_data_conv((void *) data_page))
879 goto out4;
880 }
881 }
882
883 retval = do_mount(kernel_dev, dir_page, kernel_type,
884 flags, (void*)data_page);
885
886 out4:
887 free_page(data_page);
888 out3:
889 kfree(kernel_dev);
890 out2:
891 putname(dir_page);
892 out1:
893 kfree(kernel_type);
894 out:
895 return retval;
896 }
897
898 struct compat_old_linux_dirent {
899 compat_ulong_t d_ino;
900 compat_ulong_t d_offset;
901 unsigned short d_namlen;
902 char d_name[1];
903 };
904
905 struct compat_readdir_callback {
906 struct compat_old_linux_dirent __user *dirent;
907 int result;
908 };
909
910 static int compat_fillonedir(void *__buf, const char *name, int namlen,
911 loff_t offset, u64 ino, unsigned int d_type)
912 {
913 struct compat_readdir_callback *buf = __buf;
914 struct compat_old_linux_dirent __user *dirent;
915 compat_ulong_t d_ino;
916
917 if (buf->result)
918 return -EINVAL;
919 d_ino = ino;
920 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
921 buf->result = -EOVERFLOW;
922 return -EOVERFLOW;
923 }
924 buf->result++;
925 dirent = buf->dirent;
926 if (!access_ok(VERIFY_WRITE, dirent,
927 (unsigned long)(dirent->d_name + namlen + 1) -
928 (unsigned long)dirent))
929 goto efault;
930 if ( __put_user(d_ino, &dirent->d_ino) ||
931 __put_user(offset, &dirent->d_offset) ||
932 __put_user(namlen, &dirent->d_namlen) ||
933 __copy_to_user(dirent->d_name, name, namlen) ||
934 __put_user(0, dirent->d_name + namlen))
935 goto efault;
936 return 0;
937 efault:
938 buf->result = -EFAULT;
939 return -EFAULT;
940 }
941
942 asmlinkage long compat_sys_old_readdir(unsigned int fd,
943 struct compat_old_linux_dirent __user *dirent, unsigned int count)
944 {
945 int error;
946 struct file *file;
947 struct compat_readdir_callback buf;
948
949 error = -EBADF;
950 file = fget(fd);
951 if (!file)
952 goto out;
953
954 buf.result = 0;
955 buf.dirent = dirent;
956
957 error = vfs_readdir(file, compat_fillonedir, &buf);
958 if (buf.result)
959 error = buf.result;
960
961 fput(file);
962 out:
963 return error;
964 }
965
966 struct compat_linux_dirent {
967 compat_ulong_t d_ino;
968 compat_ulong_t d_off;
969 unsigned short d_reclen;
970 char d_name[1];
971 };
972
973 struct compat_getdents_callback {
974 struct compat_linux_dirent __user *current_dir;
975 struct compat_linux_dirent __user *previous;
976 int count;
977 int error;
978 };
979
980 static int compat_filldir(void *__buf, const char *name, int namlen,
981 loff_t offset, u64 ino, unsigned int d_type)
982 {
983 struct compat_linux_dirent __user * dirent;
984 struct compat_getdents_callback *buf = __buf;
985 compat_ulong_t d_ino;
986 int reclen = ALIGN(offsetof(struct compat_linux_dirent, d_name) +
987 namlen + 2, sizeof(compat_long_t));
988
989 buf->error = -EINVAL; /* only used if we fail.. */
990 if (reclen > buf->count)
991 return -EINVAL;
992 d_ino = ino;
993 if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
994 buf->error = -EOVERFLOW;
995 return -EOVERFLOW;
996 }
997 dirent = buf->previous;
998 if (dirent) {
999 if (__put_user(offset, &dirent->d_off))
1000 goto efault;
1001 }
1002 dirent = buf->current_dir;
1003 if (__put_user(d_ino, &dirent->d_ino))
1004 goto efault;
1005 if (__put_user(reclen, &dirent->d_reclen))
1006 goto efault;
1007 if (copy_to_user(dirent->d_name, name, namlen))
1008 goto efault;
1009 if (__put_user(0, dirent->d_name + namlen))
1010 goto efault;
1011 if (__put_user(d_type, (char __user *) dirent + reclen - 1))
1012 goto efault;
1013 buf->previous = dirent;
1014 dirent = (void __user *)dirent + reclen;
1015 buf->current_dir = dirent;
1016 buf->count -= reclen;
1017 return 0;
1018 efault:
1019 buf->error = -EFAULT;
1020 return -EFAULT;
1021 }
1022
1023 asmlinkage long compat_sys_getdents(unsigned int fd,
1024 struct compat_linux_dirent __user *dirent, unsigned int count)
1025 {
1026 struct file * file;
1027 struct compat_linux_dirent __user * lastdirent;
1028 struct compat_getdents_callback buf;
1029 int error;
1030
1031 error = -EFAULT;
1032 if (!access_ok(VERIFY_WRITE, dirent, count))
1033 goto out;
1034
1035 error = -EBADF;
1036 file = fget(fd);
1037 if (!file)
1038 goto out;
1039
1040 buf.current_dir = dirent;
1041 buf.previous = NULL;
1042 buf.count = count;
1043 buf.error = 0;
1044
1045 error = vfs_readdir(file, compat_filldir, &buf);
1046 if (error >= 0)
1047 error = buf.error;
1048 lastdirent = buf.previous;
1049 if (lastdirent) {
1050 if (put_user(file->f_pos, &lastdirent->d_off))
1051 error = -EFAULT;
1052 else
1053 error = count - buf.count;
1054 }
1055 fput(file);
1056 out:
1057 return error;
1058 }
1059
1060 #ifndef __ARCH_OMIT_COMPAT_SYS_GETDENTS64
1061
1062 struct compat_getdents_callback64 {
1063 struct linux_dirent64 __user *current_dir;
1064 struct linux_dirent64 __user *previous;
1065 int count;
1066 int error;
1067 };
1068
1069 static int compat_filldir64(void * __buf, const char * name, int namlen, loff_t offset,
1070 u64 ino, unsigned int d_type)
1071 {
1072 struct linux_dirent64 __user *dirent;
1073 struct compat_getdents_callback64 *buf = __buf;
1074 int reclen = ALIGN(offsetof(struct linux_dirent64, d_name) + namlen + 1,
1075 sizeof(u64));
1076 u64 off;
1077
1078 buf->error = -EINVAL; /* only used if we fail.. */
1079 if (reclen > buf->count)
1080 return -EINVAL;
1081 dirent = buf->previous;
1082
1083 if (dirent) {
1084 if (__put_user_unaligned(offset, &dirent->d_off))
1085 goto efault;
1086 }
1087 dirent = buf->current_dir;
1088 if (__put_user_unaligned(ino, &dirent->d_ino))
1089 goto efault;
1090 off = 0;
1091 if (__put_user_unaligned(off, &dirent->d_off))
1092 goto efault;
1093 if (__put_user(reclen, &dirent->d_reclen))
1094 goto efault;
1095 if (__put_user(d_type, &dirent->d_type))
1096 goto efault;
1097 if (copy_to_user(dirent->d_name, name, namlen))
1098 goto efault;
1099 if (__put_user(0, dirent->d_name + namlen))
1100 goto efault;
1101 buf->previous = dirent;
1102 dirent = (void __user *)dirent + reclen;
1103 buf->current_dir = dirent;
1104 buf->count -= reclen;
1105 return 0;
1106 efault:
1107 buf->error = -EFAULT;
1108 return -EFAULT;
1109 }
1110
1111 asmlinkage long compat_sys_getdents64(unsigned int fd,
1112 struct linux_dirent64 __user * dirent, unsigned int count)
1113 {
1114 struct file * file;
1115 struct linux_dirent64 __user * lastdirent;
1116 struct compat_getdents_callback64 buf;
1117 int error;
1118
1119 error = -EFAULT;
1120 if (!access_ok(VERIFY_WRITE, dirent, count))
1121 goto out;
1122
1123 error = -EBADF;
1124 file = fget(fd);
1125 if (!file)
1126 goto out;
1127
1128 buf.current_dir = dirent;
1129 buf.previous = NULL;
1130 buf.count = count;
1131 buf.error = 0;
1132
1133 error = vfs_readdir(file, compat_filldir64, &buf);
1134 if (error >= 0)
1135 error = buf.error;
1136 lastdirent = buf.previous;
1137 if (lastdirent) {
1138 typeof(lastdirent->d_off) d_off = file->f_pos;
1139 if (__put_user_unaligned(d_off, &lastdirent->d_off))
1140 error = -EFAULT;
1141 else
1142 error = count - buf.count;
1143 }
1144 fput(file);
1145 out:
1146 return error;
1147 }
1148 #endif /* ! __ARCH_OMIT_COMPAT_SYS_GETDENTS64 */
1149
1150 static ssize_t compat_do_readv_writev(int type, struct file *file,
1151 const struct compat_iovec __user *uvector,
1152 unsigned long nr_segs, loff_t *pos)
1153 {
1154 compat_ssize_t tot_len;
1155 struct iovec iovstack[UIO_FASTIOV];
1156 struct iovec *iov = iovstack;
1157 ssize_t ret;
1158 io_fn_t fn;
1159 iov_fn_t fnv;
1160
1161 ret = -EINVAL;
1162 if (!file->f_op)
1163 goto out;
1164
1165 ret = -EFAULT;
1166 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
1167 goto out;
1168
1169 tot_len = compat_rw_copy_check_uvector(type, uvector, nr_segs,
1170 UIO_FASTIOV, iovstack, &iov);
1171 if (tot_len == 0) {
1172 ret = 0;
1173 goto out;
1174 }
1175
1176 ret = rw_verify_area(type, file, pos, tot_len);
1177 if (ret < 0)
1178 goto out;
1179
1180 fnv = NULL;
1181 if (type == READ) {
1182 fn = file->f_op->read;
1183 fnv = file->f_op->aio_read;
1184 } else {
1185 fn = (io_fn_t)file->f_op->write;
1186 fnv = file->f_op->aio_write;
1187 }
1188
1189 if (fnv)
1190 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
1191 pos, fnv);
1192 else
1193 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
1194
1195 out:
1196 if (iov != iovstack)
1197 kfree(iov);
1198 if ((ret + (type == READ)) > 0) {
1199 if (type == READ)
1200 fsnotify_access(file);
1201 else
1202 fsnotify_modify(file);
1203 }
1204 return ret;
1205 }
1206
1207 static size_t compat_readv(struct file *file,
1208 const struct compat_iovec __user *vec,
1209 unsigned long vlen, loff_t *pos)
1210 {
1211 ssize_t ret = -EBADF;
1212
1213 if (!(file->f_mode & FMODE_READ))
1214 goto out;
1215
1216 ret = -EINVAL;
1217 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
1218 goto out;
1219
1220 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
1221
1222 out:
1223 if (ret > 0)
1224 add_rchar(current, ret);
1225 inc_syscr(current);
1226 return ret;
1227 }
1228
1229 asmlinkage ssize_t
1230 compat_sys_readv(unsigned long fd, const struct compat_iovec __user *vec,
1231 unsigned long vlen)
1232 {
1233 struct file *file;
1234 int fput_needed;
1235 ssize_t ret;
1236
1237 file = fget_light(fd, &fput_needed);
1238 if (!file)
1239 return -EBADF;
1240 ret = compat_readv(file, vec, vlen, &file->f_pos);
1241 fput_light(file, fput_needed);
1242 return ret;
1243 }
1244
1245 asmlinkage ssize_t
1246 compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
1247 unsigned long vlen, u32 pos_low, u32 pos_high)
1248 {
1249 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1250 struct file *file;
1251 int fput_needed;
1252 ssize_t ret;
1253
1254 if (pos < 0)
1255 return -EINVAL;
1256 file = fget_light(fd, &fput_needed);
1257 if (!file)
1258 return -EBADF;
1259 ret = compat_readv(file, vec, vlen, &pos);
1260 fput_light(file, fput_needed);
1261 return ret;
1262 }
1263
1264 static size_t compat_writev(struct file *file,
1265 const struct compat_iovec __user *vec,
1266 unsigned long vlen, loff_t *pos)
1267 {
1268 ssize_t ret = -EBADF;
1269
1270 if (!(file->f_mode & FMODE_WRITE))
1271 goto out;
1272
1273 ret = -EINVAL;
1274 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1275 goto out;
1276
1277 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1278
1279 out:
1280 if (ret > 0)
1281 add_wchar(current, ret);
1282 inc_syscw(current);
1283 return ret;
1284 }
1285
1286 asmlinkage ssize_t
1287 compat_sys_writev(unsigned long fd, const struct compat_iovec __user *vec,
1288 unsigned long vlen)
1289 {
1290 struct file *file;
1291 int fput_needed;
1292 ssize_t ret;
1293
1294 file = fget_light(fd, &fput_needed);
1295 if (!file)
1296 return -EBADF;
1297 ret = compat_writev(file, vec, vlen, &file->f_pos);
1298 fput_light(file, fput_needed);
1299 return ret;
1300 }
1301
1302 asmlinkage ssize_t
1303 compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
1304 unsigned long vlen, u32 pos_low, u32 pos_high)
1305 {
1306 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1307 struct file *file;
1308 int fput_needed;
1309 ssize_t ret;
1310
1311 if (pos < 0)
1312 return -EINVAL;
1313 file = fget_light(fd, &fput_needed);
1314 if (!file)
1315 return -EBADF;
1316 ret = compat_writev(file, vec, vlen, &pos);
1317 fput_light(file, fput_needed);
1318 return ret;
1319 }
1320
1321 asmlinkage long
1322 compat_sys_vmsplice(int fd, const struct compat_iovec __user *iov32,
1323 unsigned int nr_segs, unsigned int flags)
1324 {
1325 unsigned i;
1326 struct iovec __user *iov;
1327 if (nr_segs > UIO_MAXIOV)
1328 return -EINVAL;
1329 iov = compat_alloc_user_space(nr_segs * sizeof(struct iovec));
1330 for (i = 0; i < nr_segs; i++) {
1331 struct compat_iovec v;
1332 if (get_user(v.iov_base, &iov32[i].iov_base) ||
1333 get_user(v.iov_len, &iov32[i].iov_len) ||
1334 put_user(compat_ptr(v.iov_base), &iov[i].iov_base) ||
1335 put_user(v.iov_len, &iov[i].iov_len))
1336 return -EFAULT;
1337 }
1338 return sys_vmsplice(fd, iov, nr_segs, flags);
1339 }
1340
1341 /*
1342 * Exactly like fs/open.c:sys_open(), except that it doesn't set the
1343 * O_LARGEFILE flag.
1344 */
1345 asmlinkage long
1346 compat_sys_open(const char __user *filename, int flags, int mode)
1347 {
1348 return do_sys_open(AT_FDCWD, filename, flags, mode);
1349 }
1350
1351 /*
1352 * Exactly like fs/open.c:sys_openat(), except that it doesn't set the
1353 * O_LARGEFILE flag.
1354 */
1355 asmlinkage long
1356 compat_sys_openat(unsigned int dfd, const char __user *filename, int flags, int mode)
1357 {
1358 return do_sys_open(dfd, filename, flags, mode);
1359 }
1360
1361 /*
1362 * compat_count() counts the number of arguments/envelopes. It is basically
1363 * a copy of count() from fs/exec.c, except that it works with 32 bit argv
1364 * and envp pointers.
1365 */
1366 static int compat_count(compat_uptr_t __user *argv, int max)
1367 {
1368 int i = 0;
1369
1370 if (argv != NULL) {
1371 for (;;) {
1372 compat_uptr_t p;
1373
1374 if (get_user(p, argv))
1375 return -EFAULT;
1376 if (!p)
1377 break;
1378 argv++;
1379 if (i++ >= max)
1380 return -E2BIG;
1381 }
1382 }
1383 return i;
1384 }
1385
1386 /*
1387 * compat_copy_strings() is basically a copy of copy_strings() from fs/exec.c
1388 * except that it works with 32 bit argv and envp pointers.
1389 */
1390 static int compat_copy_strings(int argc, compat_uptr_t __user *argv,
1391 struct linux_binprm *bprm)
1392 {
1393 struct page *kmapped_page = NULL;
1394 char *kaddr = NULL;
1395 unsigned long kpos = 0;
1396 int ret;
1397
1398 while (argc-- > 0) {
1399 compat_uptr_t str;
1400 int len;
1401 unsigned long pos;
1402
1403 if (get_user(str, argv+argc) ||
1404 !(len = strnlen_user(compat_ptr(str), MAX_ARG_STRLEN))) {
1405 ret = -EFAULT;
1406 goto out;
1407 }
1408
1409 if (len > MAX_ARG_STRLEN) {
1410 ret = -E2BIG;
1411 goto out;
1412 }
1413
1414 /* We're going to work our way backwords. */
1415 pos = bprm->p;
1416 str += len;
1417 bprm->p -= len;
1418
1419 while (len > 0) {
1420 int offset, bytes_to_copy;
1421
1422 offset = pos % PAGE_SIZE;
1423 if (offset == 0)
1424 offset = PAGE_SIZE;
1425
1426 bytes_to_copy = offset;
1427 if (bytes_to_copy > len)
1428 bytes_to_copy = len;
1429
1430 offset -= bytes_to_copy;
1431 pos -= bytes_to_copy;
1432 str -= bytes_to_copy;
1433 len -= bytes_to_copy;
1434
1435 if (!kmapped_page || kpos != (pos & PAGE_MASK)) {
1436 struct page *page;
1437
1438 #ifdef CONFIG_STACK_GROWSUP
1439 ret = expand_stack_downwards(bprm->vma, pos);
1440 if (ret < 0) {
1441 /* We've exceed the stack rlimit. */
1442 ret = -E2BIG;
1443 goto out;
1444 }
1445 #endif
1446 ret = get_user_pages(current, bprm->mm, pos,
1447 1, 1, 1, &page, NULL);
1448 if (ret <= 0) {
1449 /* We've exceed the stack rlimit. */
1450 ret = -E2BIG;
1451 goto out;
1452 }
1453
1454 if (kmapped_page) {
1455 flush_kernel_dcache_page(kmapped_page);
1456 kunmap(kmapped_page);
1457 put_page(kmapped_page);
1458 }
1459 kmapped_page = page;
1460 kaddr = kmap(kmapped_page);
1461 kpos = pos & PAGE_MASK;
1462 flush_cache_page(bprm->vma, kpos,
1463 page_to_pfn(kmapped_page));
1464 }
1465 if (copy_from_user(kaddr+offset, compat_ptr(str),
1466 bytes_to_copy)) {
1467 ret = -EFAULT;
1468 goto out;
1469 }
1470 }
1471 }
1472 ret = 0;
1473 out:
1474 if (kmapped_page) {
1475 flush_kernel_dcache_page(kmapped_page);
1476 kunmap(kmapped_page);
1477 put_page(kmapped_page);
1478 }
1479 return ret;
1480 }
1481
1482 /*
1483 * compat_do_execve() is mostly a copy of do_execve(), with the exception
1484 * that it processes 32 bit argv and envp pointers.
1485 */
1486 int compat_do_execve(char * filename,
1487 compat_uptr_t __user *argv,
1488 compat_uptr_t __user *envp,
1489 struct pt_regs * regs)
1490 {
1491 struct linux_binprm *bprm;
1492 struct file *file;
1493 struct files_struct *displaced;
1494 bool clear_in_exec;
1495 int retval;
1496
1497 retval = unshare_files(&displaced);
1498 if (retval)
1499 goto out_ret;
1500
1501 retval = -ENOMEM;
1502 bprm = kzalloc(sizeof(*bprm), GFP_KERNEL);
1503 if (!bprm)
1504 goto out_files;
1505
1506 retval = prepare_bprm_creds(bprm);
1507 if (retval)
1508 goto out_free;
1509
1510 retval = check_unsafe_exec(bprm);
1511 if (retval < 0)
1512 goto out_free;
1513 clear_in_exec = retval;
1514 current->in_execve = 1;
1515
1516 file = open_exec(filename);
1517 retval = PTR_ERR(file);
1518 if (IS_ERR(file))
1519 goto out_unmark;
1520
1521 sched_exec();
1522
1523 bprm->file = file;
1524 bprm->filename = filename;
1525 bprm->interp = filename;
1526
1527 retval = bprm_mm_init(bprm);
1528 if (retval)
1529 goto out_file;
1530
1531 bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
1532 if ((retval = bprm->argc) < 0)
1533 goto out;
1534
1535 bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
1536 if ((retval = bprm->envc) < 0)
1537 goto out;
1538
1539 retval = prepare_binprm(bprm);
1540 if (retval < 0)
1541 goto out;
1542
1543 retval = copy_strings_kernel(1, &bprm->filename, bprm);
1544 if (retval < 0)
1545 goto out;
1546
1547 bprm->exec = bprm->p;
1548 retval = compat_copy_strings(bprm->envc, envp, bprm);
1549 if (retval < 0)
1550 goto out;
1551
1552 retval = compat_copy_strings(bprm->argc, argv, bprm);
1553 if (retval < 0)
1554 goto out;
1555
1556 retval = search_binary_handler(bprm, regs);
1557 if (retval < 0)
1558 goto out;
1559
1560 /* execve succeeded */
1561 current->fs->in_exec = 0;
1562 current->in_execve = 0;
1563 acct_update_integrals(current);
1564 free_bprm(bprm);
1565 if (displaced)
1566 put_files_struct(displaced);
1567 return retval;
1568
1569 out:
1570 if (bprm->mm)
1571 mmput(bprm->mm);
1572
1573 out_file:
1574 if (bprm->file) {
1575 allow_write_access(bprm->file);
1576 fput(bprm->file);
1577 }
1578
1579 out_unmark:
1580 if (clear_in_exec)
1581 current->fs->in_exec = 0;
1582 current->in_execve = 0;
1583
1584 out_free:
1585 free_bprm(bprm);
1586
1587 out_files:
1588 if (displaced)
1589 reset_files_struct(displaced);
1590 out_ret:
1591 return retval;
1592 }
1593
1594 #define __COMPAT_NFDBITS (8 * sizeof(compat_ulong_t))
1595
1596 static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
1597 int timeval, int ret)
1598 {
1599 struct timespec ts;
1600
1601 if (!p)
1602 return ret;
1603
1604 if (current->personality & STICKY_TIMEOUTS)
1605 goto sticky;
1606
1607 /* No update for zero timeout */
1608 if (!end_time->tv_sec && !end_time->tv_nsec)
1609 return ret;
1610
1611 ktime_get_ts(&ts);
1612 ts = timespec_sub(*end_time, ts);
1613 if (ts.tv_sec < 0)
1614 ts.tv_sec = ts.tv_nsec = 0;
1615
1616 if (timeval) {
1617 struct compat_timeval rtv;
1618
1619 rtv.tv_sec = ts.tv_sec;
1620 rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
1621
1622 if (!copy_to_user(p, &rtv, sizeof(rtv)))
1623 return ret;
1624 } else {
1625 struct compat_timespec rts;
1626
1627 rts.tv_sec = ts.tv_sec;
1628 rts.tv_nsec = ts.tv_nsec;
1629
1630 if (!copy_to_user(p, &rts, sizeof(rts)))
1631 return ret;
1632 }
1633 /*
1634 * If an application puts its timeval in read-only memory, we
1635 * don't want the Linux-specific update to the timeval to
1636 * cause a fault after the select has completed
1637 * successfully. However, because we're not updating the
1638 * timeval, we can't restart the system call.
1639 */
1640
1641 sticky:
1642 if (ret == -ERESTARTNOHAND)
1643 ret = -EINTR;
1644 return ret;
1645 }
1646
1647 /*
1648 * Ooo, nasty. We need here to frob 32-bit unsigned longs to
1649 * 64-bit unsigned longs.
1650 */
1651 static
1652 int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1653 unsigned long *fdset)
1654 {
1655 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1656 if (ufdset) {
1657 unsigned long odd;
1658
1659 if (!access_ok(VERIFY_WRITE, ufdset, nr*sizeof(compat_ulong_t)))
1660 return -EFAULT;
1661
1662 odd = nr & 1UL;
1663 nr &= ~1UL;
1664 while (nr) {
1665 unsigned long h, l;
1666 if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
1667 return -EFAULT;
1668 ufdset += 2;
1669 *fdset++ = h << 32 | l;
1670 nr -= 2;
1671 }
1672 if (odd && __get_user(*fdset, ufdset))
1673 return -EFAULT;
1674 } else {
1675 /* Tricky, must clear full unsigned long in the
1676 * kernel fdset at the end, this makes sure that
1677 * actually happens.
1678 */
1679 memset(fdset, 0, ((nr + 1) & ~1)*sizeof(compat_ulong_t));
1680 }
1681 return 0;
1682 }
1683
1684 static
1685 int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
1686 unsigned long *fdset)
1687 {
1688 unsigned long odd;
1689 nr = DIV_ROUND_UP(nr, __COMPAT_NFDBITS);
1690
1691 if (!ufdset)
1692 return 0;
1693
1694 odd = nr & 1UL;
1695 nr &= ~1UL;
1696 while (nr) {
1697 unsigned long h, l;
1698 l = *fdset++;
1699 h = l >> 32;
1700 if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
1701 return -EFAULT;
1702 ufdset += 2;
1703 nr -= 2;
1704 }
1705 if (odd && __put_user(*fdset, ufdset))
1706 return -EFAULT;
1707 return 0;
1708 }
1709
1710
1711 /*
1712 * This is a virtual copy of sys_select from fs/select.c and probably
1713 * should be compared to it from time to time
1714 */
1715
1716 /*
1717 * We can actually return ERESTARTSYS instead of EINTR, but I'd
1718 * like to be certain this leads to no problems. So I return
1719 * EINTR just for safety.
1720 *
1721 * Update: ERESTARTSYS breaks at least the xview clock binary, so
1722 * I'm trying ERESTARTNOHAND which restart only when you want to.
1723 */
1724 #define MAX_SELECT_SECONDS \
1725 ((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
1726
1727 int compat_core_sys_select(int n, compat_ulong_t __user *inp,
1728 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1729 struct timespec *end_time)
1730 {
1731 fd_set_bits fds;
1732 void *bits;
1733 int size, max_fds, ret = -EINVAL;
1734 struct fdtable *fdt;
1735 long stack_fds[SELECT_STACK_ALLOC/sizeof(long)];
1736
1737 if (n < 0)
1738 goto out_nofds;
1739
1740 /* max_fds can increase, so grab it once to avoid race */
1741 rcu_read_lock();
1742 fdt = files_fdtable(current->files);
1743 max_fds = fdt->max_fds;
1744 rcu_read_unlock();
1745 if (n > max_fds)
1746 n = max_fds;
1747
1748 /*
1749 * We need 6 bitmaps (in/out/ex for both incoming and outgoing),
1750 * since we used fdset we need to allocate memory in units of
1751 * long-words.
1752 */
1753 size = FDS_BYTES(n);
1754 bits = stack_fds;
1755 if (size > sizeof(stack_fds) / 6) {
1756 bits = kmalloc(6 * size, GFP_KERNEL);
1757 ret = -ENOMEM;
1758 if (!bits)
1759 goto out_nofds;
1760 }
1761 fds.in = (unsigned long *) bits;
1762 fds.out = (unsigned long *) (bits + size);
1763 fds.ex = (unsigned long *) (bits + 2*size);
1764 fds.res_in = (unsigned long *) (bits + 3*size);
1765 fds.res_out = (unsigned long *) (bits + 4*size);
1766 fds.res_ex = (unsigned long *) (bits + 5*size);
1767
1768 if ((ret = compat_get_fd_set(n, inp, fds.in)) ||
1769 (ret = compat_get_fd_set(n, outp, fds.out)) ||
1770 (ret = compat_get_fd_set(n, exp, fds.ex)))
1771 goto out;
1772 zero_fd_set(n, fds.res_in);
1773 zero_fd_set(n, fds.res_out);
1774 zero_fd_set(n, fds.res_ex);
1775
1776 ret = do_select(n, &fds, end_time);
1777
1778 if (ret < 0)
1779 goto out;
1780 if (!ret) {
1781 ret = -ERESTARTNOHAND;
1782 if (signal_pending(current))
1783 goto out;
1784 ret = 0;
1785 }
1786
1787 if (compat_set_fd_set(n, inp, fds.res_in) ||
1788 compat_set_fd_set(n, outp, fds.res_out) ||
1789 compat_set_fd_set(n, exp, fds.res_ex))
1790 ret = -EFAULT;
1791 out:
1792 if (bits != stack_fds)
1793 kfree(bits);
1794 out_nofds:
1795 return ret;
1796 }
1797
1798 asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
1799 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1800 struct compat_timeval __user *tvp)
1801 {
1802 struct timespec end_time, *to = NULL;
1803 struct compat_timeval tv;
1804 int ret;
1805
1806 if (tvp) {
1807 if (copy_from_user(&tv, tvp, sizeof(tv)))
1808 return -EFAULT;
1809
1810 to = &end_time;
1811 if (poll_select_set_timeout(to,
1812 tv.tv_sec + (tv.tv_usec / USEC_PER_SEC),
1813 (tv.tv_usec % USEC_PER_SEC) * NSEC_PER_USEC))
1814 return -EINVAL;
1815 }
1816
1817 ret = compat_core_sys_select(n, inp, outp, exp, to);
1818 ret = poll_select_copy_remaining(&end_time, tvp, 1, ret);
1819
1820 return ret;
1821 }
1822
1823 struct compat_sel_arg_struct {
1824 compat_ulong_t n;
1825 compat_uptr_t inp;
1826 compat_uptr_t outp;
1827 compat_uptr_t exp;
1828 compat_uptr_t tvp;
1829 };
1830
1831 asmlinkage long compat_sys_old_select(struct compat_sel_arg_struct __user *arg)
1832 {
1833 struct compat_sel_arg_struct a;
1834
1835 if (copy_from_user(&a, arg, sizeof(a)))
1836 return -EFAULT;
1837 return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
1838 compat_ptr(a.exp), compat_ptr(a.tvp));
1839 }
1840
1841 #ifdef HAVE_SET_RESTORE_SIGMASK
1842 static long do_compat_pselect(int n, compat_ulong_t __user *inp,
1843 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1844 struct compat_timespec __user *tsp, compat_sigset_t __user *sigmask,
1845 compat_size_t sigsetsize)
1846 {
1847 compat_sigset_t ss32;
1848 sigset_t ksigmask, sigsaved;
1849 struct compat_timespec ts;
1850 struct timespec end_time, *to = NULL;
1851 int ret;
1852
1853 if (tsp) {
1854 if (copy_from_user(&ts, tsp, sizeof(ts)))
1855 return -EFAULT;
1856
1857 to = &end_time;
1858 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1859 return -EINVAL;
1860 }
1861
1862 if (sigmask) {
1863 if (sigsetsize != sizeof(compat_sigset_t))
1864 return -EINVAL;
1865 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1866 return -EFAULT;
1867 sigset_from_compat(&ksigmask, &ss32);
1868
1869 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1870 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1871 }
1872
1873 ret = compat_core_sys_select(n, inp, outp, exp, to);
1874 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1875
1876 if (ret == -ERESTARTNOHAND) {
1877 /*
1878 * Don't restore the signal mask yet. Let do_signal() deliver
1879 * the signal on the way back to userspace, before the signal
1880 * mask is restored.
1881 */
1882 if (sigmask) {
1883 memcpy(&current->saved_sigmask, &sigsaved,
1884 sizeof(sigsaved));
1885 set_restore_sigmask();
1886 }
1887 } else if (sigmask)
1888 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1889
1890 return ret;
1891 }
1892
1893 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
1894 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
1895 struct compat_timespec __user *tsp, void __user *sig)
1896 {
1897 compat_size_t sigsetsize = 0;
1898 compat_uptr_t up = 0;
1899
1900 if (sig) {
1901 if (!access_ok(VERIFY_READ, sig,
1902 sizeof(compat_uptr_t)+sizeof(compat_size_t)) ||
1903 __get_user(up, (compat_uptr_t __user *)sig) ||
1904 __get_user(sigsetsize,
1905 (compat_size_t __user *)(sig+sizeof(up))))
1906 return -EFAULT;
1907 }
1908 return do_compat_pselect(n, inp, outp, exp, tsp, compat_ptr(up),
1909 sigsetsize);
1910 }
1911
1912 asmlinkage long compat_sys_ppoll(struct pollfd __user *ufds,
1913 unsigned int nfds, struct compat_timespec __user *tsp,
1914 const compat_sigset_t __user *sigmask, compat_size_t sigsetsize)
1915 {
1916 compat_sigset_t ss32;
1917 sigset_t ksigmask, sigsaved;
1918 struct compat_timespec ts;
1919 struct timespec end_time, *to = NULL;
1920 int ret;
1921
1922 if (tsp) {
1923 if (copy_from_user(&ts, tsp, sizeof(ts)))
1924 return -EFAULT;
1925
1926 to = &end_time;
1927 if (poll_select_set_timeout(to, ts.tv_sec, ts.tv_nsec))
1928 return -EINVAL;
1929 }
1930
1931 if (sigmask) {
1932 if (sigsetsize != sizeof(compat_sigset_t))
1933 return -EINVAL;
1934 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
1935 return -EFAULT;
1936 sigset_from_compat(&ksigmask, &ss32);
1937
1938 sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
1939 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
1940 }
1941
1942 ret = do_sys_poll(ufds, nfds, to);
1943
1944 /* We can restart this syscall, usually */
1945 if (ret == -EINTR) {
1946 /*
1947 * Don't restore the signal mask yet. Let do_signal() deliver
1948 * the signal on the way back to userspace, before the signal
1949 * mask is restored.
1950 */
1951 if (sigmask) {
1952 memcpy(&current->saved_sigmask, &sigsaved,
1953 sizeof(sigsaved));
1954 set_restore_sigmask();
1955 }
1956 ret = -ERESTARTNOHAND;
1957 } else if (sigmask)
1958 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1959
1960 ret = poll_select_copy_remaining(&end_time, tsp, 0, ret);
1961
1962 return ret;
1963 }
1964 #endif /* HAVE_SET_RESTORE_SIGMASK */
1965
1966 #if defined(CONFIG_NFSD) || defined(CONFIG_NFSD_MODULE)
1967 /* Stuff for NFS server syscalls... */
1968 struct compat_nfsctl_svc {
1969 u16 svc32_port;
1970 s32 svc32_nthreads;
1971 };
1972
1973 struct compat_nfsctl_client {
1974 s8 cl32_ident[NFSCLNT_IDMAX+1];
1975 s32 cl32_naddr;
1976 struct in_addr cl32_addrlist[NFSCLNT_ADDRMAX];
1977 s32 cl32_fhkeytype;
1978 s32 cl32_fhkeylen;
1979 u8 cl32_fhkey[NFSCLNT_KEYMAX];
1980 };
1981
1982 struct compat_nfsctl_export {
1983 char ex32_client[NFSCLNT_IDMAX+1];
1984 char ex32_path[NFS_MAXPATHLEN+1];
1985 compat_dev_t ex32_dev;
1986 compat_ino_t ex32_ino;
1987 compat_int_t ex32_flags;
1988 __compat_uid_t ex32_anon_uid;
1989 __compat_gid_t ex32_anon_gid;
1990 };
1991
1992 struct compat_nfsctl_fdparm {
1993 struct sockaddr gd32_addr;
1994 s8 gd32_path[NFS_MAXPATHLEN+1];
1995 compat_int_t gd32_version;
1996 };
1997
1998 struct compat_nfsctl_fsparm {
1999 struct sockaddr gd32_addr;
2000 s8 gd32_path[NFS_MAXPATHLEN+1];
2001 compat_int_t gd32_maxlen;
2002 };
2003
2004 struct compat_nfsctl_arg {
2005 compat_int_t ca32_version; /* safeguard */
2006 union {
2007 struct compat_nfsctl_svc u32_svc;
2008 struct compat_nfsctl_client u32_client;
2009 struct compat_nfsctl_export u32_export;
2010 struct compat_nfsctl_fdparm u32_getfd;
2011 struct compat_nfsctl_fsparm u32_getfs;
2012 } u;
2013 #define ca32_svc u.u32_svc
2014 #define ca32_client u.u32_client
2015 #define ca32_export u.u32_export
2016 #define ca32_getfd u.u32_getfd
2017 #define ca32_getfs u.u32_getfs
2018 };
2019
2020 union compat_nfsctl_res {
2021 __u8 cr32_getfh[NFS_FHSIZE];
2022 struct knfsd_fh cr32_getfs;
2023 };
2024
2025 static int compat_nfs_svc_trans(struct nfsctl_arg *karg,
2026 struct compat_nfsctl_arg __user *arg)
2027 {
2028 if (!access_ok(VERIFY_READ, &arg->ca32_svc, sizeof(arg->ca32_svc)) ||
2029 get_user(karg->ca_version, &arg->ca32_version) ||
2030 __get_user(karg->ca_svc.svc_port, &arg->ca32_svc.svc32_port) ||
2031 __get_user(karg->ca_svc.svc_nthreads,
2032 &arg->ca32_svc.svc32_nthreads))
2033 return -EFAULT;
2034 return 0;
2035 }
2036
2037 static int compat_nfs_clnt_trans(struct nfsctl_arg *karg,
2038 struct compat_nfsctl_arg __user *arg)
2039 {
2040 if (!access_ok(VERIFY_READ, &arg->ca32_client,
2041 sizeof(arg->ca32_client)) ||
2042 get_user(karg->ca_version, &arg->ca32_version) ||
2043 __copy_from_user(&karg->ca_client.cl_ident[0],
2044 &arg->ca32_client.cl32_ident[0],
2045 NFSCLNT_IDMAX) ||
2046 __get_user(karg->ca_client.cl_naddr,
2047 &arg->ca32_client.cl32_naddr) ||
2048 __copy_from_user(&karg->ca_client.cl_addrlist[0],
2049 &arg->ca32_client.cl32_addrlist[0],
2050 (sizeof(struct in_addr) * NFSCLNT_ADDRMAX)) ||
2051 __get_user(karg->ca_client.cl_fhkeytype,
2052 &arg->ca32_client.cl32_fhkeytype) ||
2053 __get_user(karg->ca_client.cl_fhkeylen,
2054 &arg->ca32_client.cl32_fhkeylen) ||
2055 __copy_from_user(&karg->ca_client.cl_fhkey[0],
2056 &arg->ca32_client.cl32_fhkey[0],
2057 NFSCLNT_KEYMAX))
2058 return -EFAULT;
2059
2060 return 0;
2061 }
2062
2063 static int compat_nfs_exp_trans(struct nfsctl_arg *karg,
2064 struct compat_nfsctl_arg __user *arg)
2065 {
2066 if (!access_ok(VERIFY_READ, &arg->ca32_export,
2067 sizeof(arg->ca32_export)) ||
2068 get_user(karg->ca_version, &arg->ca32_version) ||
2069 __copy_from_user(&karg->ca_export.ex_client[0],
2070 &arg->ca32_export.ex32_client[0],
2071 NFSCLNT_IDMAX) ||
2072 __copy_from_user(&karg->ca_export.ex_path[0],
2073 &arg->ca32_export.ex32_path[0],
2074 NFS_MAXPATHLEN) ||
2075 __get_user(karg->ca_export.ex_dev,
2076 &arg->ca32_export.ex32_dev) ||
2077 __get_user(karg->ca_export.ex_ino,
2078 &arg->ca32_export.ex32_ino) ||
2079 __get_user(karg->ca_export.ex_flags,
2080 &arg->ca32_export.ex32_flags) ||
2081 __get_user(karg->ca_export.ex_anon_uid,
2082 &arg->ca32_export.ex32_anon_uid) ||
2083 __get_user(karg->ca_export.ex_anon_gid,
2084 &arg->ca32_export.ex32_anon_gid))
2085 return -EFAULT;
2086 SET_UID(karg->ca_export.ex_anon_uid, karg->ca_export.ex_anon_uid);
2087 SET_GID(karg->ca_export.ex_anon_gid, karg->ca_export.ex_anon_gid);
2088
2089 return 0;
2090 }
2091
2092 static int compat_nfs_getfd_trans(struct nfsctl_arg *karg,
2093 struct compat_nfsctl_arg __user *arg)
2094 {
2095 if (!access_ok(VERIFY_READ, &arg->ca32_getfd,
2096 sizeof(arg->ca32_getfd)) ||
2097 get_user(karg->ca_version, &arg->ca32_version) ||
2098 __copy_from_user(&karg->ca_getfd.gd_addr,
2099 &arg->ca32_getfd.gd32_addr,
2100 (sizeof(struct sockaddr))) ||
2101 __copy_from_user(&karg->ca_getfd.gd_path,
2102 &arg->ca32_getfd.gd32_path,
2103 (NFS_MAXPATHLEN+1)) ||
2104 __get_user(karg->ca_getfd.gd_version,
2105 &arg->ca32_getfd.gd32_version))
2106 return -EFAULT;
2107
2108 return 0;
2109 }
2110
2111 static int compat_nfs_getfs_trans(struct nfsctl_arg *karg,
2112 struct compat_nfsctl_arg __user *arg)
2113 {
2114 if (!access_ok(VERIFY_READ,&arg->ca32_getfs,sizeof(arg->ca32_getfs)) ||
2115 get_user(karg->ca_version, &arg->ca32_version) ||
2116 __copy_from_user(&karg->ca_getfs.gd_addr,
2117 &arg->ca32_getfs.gd32_addr,
2118 (sizeof(struct sockaddr))) ||
2119 __copy_from_user(&karg->ca_getfs.gd_path,
2120 &arg->ca32_getfs.gd32_path,
2121 (NFS_MAXPATHLEN+1)) ||
2122 __get_user(karg->ca_getfs.gd_maxlen,
2123 &arg->ca32_getfs.gd32_maxlen))
2124 return -EFAULT;
2125
2126 return 0;
2127 }
2128
2129 /* This really doesn't need translations, we are only passing
2130 * back a union which contains opaque nfs file handle data.
2131 */
2132 static int compat_nfs_getfh_res_trans(union nfsctl_res *kres,
2133 union compat_nfsctl_res __user *res)
2134 {
2135 int err;
2136
2137 err = copy_to_user(res, kres, sizeof(*res));
2138
2139 return (err) ? -EFAULT : 0;
2140 }
2141
2142 asmlinkage long compat_sys_nfsservctl(int cmd,
2143 struct compat_nfsctl_arg __user *arg,
2144 union compat_nfsctl_res __user *res)
2145 {
2146 struct nfsctl_arg *karg;
2147 union nfsctl_res *kres;
2148 mm_segment_t oldfs;
2149 int err;
2150
2151 karg = kmalloc(sizeof(*karg), GFP_USER);
2152 kres = kmalloc(sizeof(*kres), GFP_USER);
2153 if(!karg || !kres) {
2154 err = -ENOMEM;
2155 goto done;
2156 }
2157
2158 switch(cmd) {
2159 case NFSCTL_SVC:
2160 err = compat_nfs_svc_trans(karg, arg);
2161 break;
2162
2163 case NFSCTL_ADDCLIENT:
2164 err = compat_nfs_clnt_trans(karg, arg);
2165 break;
2166
2167 case NFSCTL_DELCLIENT:
2168 err = compat_nfs_clnt_trans(karg, arg);
2169 break;
2170
2171 case NFSCTL_EXPORT:
2172 case NFSCTL_UNEXPORT:
2173 err = compat_nfs_exp_trans(karg, arg);
2174 break;
2175
2176 case NFSCTL_GETFD:
2177 err = compat_nfs_getfd_trans(karg, arg);
2178 break;
2179
2180 case NFSCTL_GETFS:
2181 err = compat_nfs_getfs_trans(karg, arg);
2182 break;
2183
2184 default:
2185 err = -EINVAL;
2186 break;
2187 }
2188
2189 if (err)
2190 goto done;
2191
2192 oldfs = get_fs();
2193 set_fs(KERNEL_DS);
2194 /* The __user pointer casts are valid because of the set_fs() */
2195 err = sys_nfsservctl(cmd, (void __user *) karg, (void __user *) kres);
2196 set_fs(oldfs);
2197
2198 if (err)
2199 goto done;
2200
2201 if((cmd == NFSCTL_GETFD) ||
2202 (cmd == NFSCTL_GETFS))
2203 err = compat_nfs_getfh_res_trans(kres, res);
2204
2205 done:
2206 kfree(karg);
2207 kfree(kres);
2208 return err;
2209 }
2210 #else /* !NFSD */
2211 long asmlinkage compat_sys_nfsservctl(int cmd, void *notused, void *notused2)
2212 {
2213 return sys_ni_syscall();
2214 }
2215 #endif
2216
2217 #ifdef CONFIG_EPOLL
2218
2219 #ifdef HAVE_SET_RESTORE_SIGMASK
2220 asmlinkage long compat_sys_epoll_pwait(int epfd,
2221 struct compat_epoll_event __user *events,
2222 int maxevents, int timeout,
2223 const compat_sigset_t __user *sigmask,
2224 compat_size_t sigsetsize)
2225 {
2226 long err;
2227 compat_sigset_t csigmask;
2228 sigset_t ksigmask, sigsaved;
2229
2230 /*
2231 * If the caller wants a certain signal mask to be set during the wait,
2232 * we apply it here.
2233 */
2234 if (sigmask) {
2235 if (sigsetsize != sizeof(compat_sigset_t))
2236 return -EINVAL;
2237 if (copy_from_user(&csigmask, sigmask, sizeof(csigmask)))
2238 return -EFAULT;
2239 sigset_from_compat(&ksigmask, &csigmask);
2240 sigdelsetmask(&ksigmask, sigmask(SIGKILL) | sigmask(SIGSTOP));
2241 sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
2242 }
2243
2244 err = sys_epoll_wait(epfd, events, maxevents, timeout);
2245
2246 /*
2247 * If we changed the signal mask, we need to restore the original one.
2248 * In case we've got a signal while waiting, we do not restore the
2249 * signal mask yet, and we allow do_signal() to deliver the signal on
2250 * the way back to userspace, before the signal mask is restored.
2251 */
2252 if (sigmask) {
2253 if (err == -EINTR) {
2254 memcpy(&current->saved_sigmask, &sigsaved,
2255 sizeof(sigsaved));
2256 set_restore_sigmask();
2257 } else
2258 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2259 }
2260
2261 return err;
2262 }
2263 #endif /* HAVE_SET_RESTORE_SIGMASK */
2264
2265 #endif /* CONFIG_EPOLL */
2266
2267 #ifdef CONFIG_SIGNALFD
2268
2269 asmlinkage long compat_sys_signalfd4(int ufd,
2270 const compat_sigset_t __user *sigmask,
2271 compat_size_t sigsetsize, int flags)
2272 {
2273 compat_sigset_t ss32;
2274 sigset_t tmp;
2275 sigset_t __user *ksigmask;
2276
2277 if (sigsetsize != sizeof(compat_sigset_t))
2278 return -EINVAL;
2279 if (copy_from_user(&ss32, sigmask, sizeof(ss32)))
2280 return -EFAULT;
2281 sigset_from_compat(&tmp, &ss32);
2282 ksigmask = compat_alloc_user_space(sizeof(sigset_t));
2283 if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
2284 return -EFAULT;
2285
2286 return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
2287 }
2288
2289 asmlinkage long compat_sys_signalfd(int ufd,
2290 const compat_sigset_t __user *sigmask,
2291 compat_size_t sigsetsize)
2292 {
2293 return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
2294 }
2295 #endif /* CONFIG_SIGNALFD */
2296
2297 #ifdef CONFIG_TIMERFD
2298
2299 asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
2300 const struct compat_itimerspec __user *utmr,
2301 struct compat_itimerspec __user *otmr)
2302 {
2303 int error;
2304 struct itimerspec t;
2305 struct itimerspec __user *ut;
2306
2307 if (get_compat_itimerspec(&t, utmr))
2308 return -EFAULT;
2309 ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
2310 if (copy_to_user(&ut[0], &t, sizeof(t)))
2311 return -EFAULT;
2312 error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
2313 if (!error && otmr)
2314 error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
2315 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2316
2317 return error;
2318 }
2319
2320 asmlinkage long compat_sys_timerfd_gettime(int ufd,
2321 struct compat_itimerspec __user *otmr)
2322 {
2323 int error;
2324 struct itimerspec t;
2325 struct itimerspec __user *ut;
2326
2327 ut = compat_alloc_user_space(sizeof(struct itimerspec));
2328 error = sys_timerfd_gettime(ufd, ut);
2329 if (!error)
2330 error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
2331 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
2332
2333 return error;
2334 }
2335
2336 #endif /* CONFIG_TIMERFD */
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